How much work is done by a Coolie to carry load on his head? - Vidyadip

Question

How much work is done by a Coolie to carry load on his head?

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Answer

Work done is zero because the force acting on load is in downward direction (weight due to gravity) and displacement is in horizontal direction.
So,
$W=F . \mathrm{s} \cos 90^{\circ}$
$W=0$

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